Implement ClearKey message format as JSON.

media/test/data/eme_player_js/clearkey_player.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // ClearKeyPlayer responsible for playing media using Clear Key key system and
 // the unprefixed version of EME.
 function ClearKeyPlayer(video, testConfig) {
   this.video = video;
   this.testConfig = testConfig;
 }
 
 ClearKeyPlayer.prototype.init = function() {
   PlayerUtils.initEMEPlayer(this);
 };
 
 ClearKeyPlayer.prototype.registerEventListeners = function() {
   PlayerUtils.registerEMEEventListeners(this);
 };
 
 ClearKeyPlayer.prototype.onMessage = function(message) {
   Utils.timeLog('MediaKeySession onMessage', message);
   var initData =
-      Utils.getInitDataFromMessage(message, this.testConfig.mediaType);
+      Utils.getInitDataFromMessage(message, this.testConfig.mediaType, true);
   var key = Utils.getDefaultKey(this.testConfig.forceInvalidResponse);
   var jwkSet = Utils.createJWKData(initData, key);
   if (PROMISES_SUPPORTED) {
     message.target.update(jwkSet).catch(function(error) {
       Utils.failTest(error, KEY_ERROR);
     });
   } else {
     message.target.update(jwkSet);
   }
 };